Gardai at the scene of a shooting on Dublin's Sheriff Street (Image: Collins Photo Agency)

In a separate post she said of the young dad: “He had a heart of gold, we’ll miss him something terrible.

“We were the only family he had.”

Meanwhile, the Irish Sunday Mirror reports that drug dealers selling narcotics before Mr O’Rourke was brutally murdered are understood to have continued dealing while he received CPR.

Local people could be heard screaming at dealers to stop what they were doing as medics tried in vain to save the young man’s life.

A source said: “It just goes to show the level these low lives will stoop to in order to make money.

“A young man was fighting for his life and these scumbags didn’t give a s**t.

“Locals could be heard screaming at them to stop. It really is the lowest of the low.”

Mr O’Rourke had no fixed address and had been using sheltered accommodation.

He leaves behind a girlfriend and three young children.

The feud has now claimed five lives.

Gardai are probing if Mr O’Rourke was mistakenly shot as he was wearing a similar jacket to that of the intended target. It’s believed the man who was the intended target of Thursday’s hit has since left the country.

An associate of the criminal who was targeted is believed to have asked gardai for an escort to the airport following the brutal murder.

The source added: “If this guy knows what is good for him he will get as far away from Dublin as possible. He’s clearly not safe here.

“Those behind the attack were clearly out for his blood and will no doubt keep going until they get him.”

Gardai are hopeful DNA from the weapon, which was dumped in a wheelie bin, will help them track the killer down.

The source said: “Ballistic tests will be carried out but we’re confident it is the gun used in this fatal shooting.

“Next thing to check is the DNA. Once that is taken from the gun, it will be run through a DNA database in the hope of a hit.

“If that matches up, then we have an ID and we’ll have him if the gangs don’t get to him first.”

The Irish Mirror revealed yesterday how the bungling assassin, who shot the innocent dad, may have agreed to do it in order to clear a drug debt.

He is being hunted by both the warring Kinahan and Hutch gangs – along with investigating gardai.

The Hutch mob want revenge for his attempt to kill one of their main enforcers and the Kinahans, who ordered the hit, have vowed to kill him for messing it up. The source said: “It was a very amateurish job. He didn’t have a mask, but a scarf that could fall down and he was on a pushbike.

“Where were the getaway cars and the scout cars that you would normally find burnt-out after a professional hit? There weren’t any.

“This fella might have had a spotter alright to pinpoint the target but he bungled it big time. There might have been no spotter at all. Martin O’Rourke began to run for some reason and the killer ran after him.

“He may simply have been wearing a similar jacket to the real target. The killer ended up running around in circles, blasting away like something out of a movie.

“The fact he did not have a getaway car and he dumped the gun all point to an amateur.”